CN112196975A - New forms of energy car rear axle reduction gear - Google Patents

New forms of energy car rear axle reduction gear Download PDF

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Publication number
CN112196975A
CN112196975A CN202011227296.2A CN202011227296A CN112196975A CN 112196975 A CN112196975 A CN 112196975A CN 202011227296 A CN202011227296 A CN 202011227296A CN 112196975 A CN112196975 A CN 112196975A
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CN
China
Prior art keywords
speed reducer
gear
spline
rear axle
driven gear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202011227296.2A
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Chinese (zh)
Inventor
刘洋
覃刚明
陈海江
龙文
蒙顺金
张德军
黄东杰
韦文杰
李智健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongfeng Liuzhou Motor Co Ltd
Original Assignee
Dongfeng Liuzhou Motor Co Ltd
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Filing date
Publication date
Application filed by Dongfeng Liuzhou Motor Co Ltd filed Critical Dongfeng Liuzhou Motor Co Ltd
Priority to CN202011227296.2A priority Critical patent/CN112196975A/en
Publication of CN112196975A publication Critical patent/CN112196975A/en
Withdrawn legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H57/00General details of gearing
    • F16H57/02Gearboxes; Mounting gearing therein
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H55/00Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02Toothed members; Worms
    • F16H55/08Profiling
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H57/00General details of gearing
    • F16H57/0006Vibration-damping or noise reducing means specially adapted for gearings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H57/00General details of gearing
    • F16H57/0018Shaft assemblies for gearings
    • F16H57/0025Shaft assemblies for gearings with gearing elements rigidly connected to a shaft, e.g. securing gears or pulleys by specially adapted splines, keys or methods
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H57/00General details of gearing
    • F16H57/02Gearboxes; Mounting gearing therein
    • F16H57/023Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H57/00General details of gearing
    • F16H57/02Gearboxes; Mounting gearing therein
    • F16H57/037Gearboxes for accommodating differential gearings

Abstract

The invention relates to the technical field of new energy vehicles, and discloses a rear axle speed reducer of a new energy vehicle, which comprises an integral speed reducer shell, and a power assembly, an intermediate transmission assembly and a differential mechanism which are arranged in the speed reducer shell, wherein the speed reducer shell is an integral shell; the power assembly comprises an input shaft used for being connected with a driving motor, and a first driving gear is arranged on the input shaft; the middle transmission assembly comprises a transmission shaft, and a first driven gear and a second driving gear which are arranged on the transmission shaft, the first driven gear is meshed with the first driving gear, the transmission shaft is provided with spiral spline teeth, the center of the first driven gear is provided with a spline hole, the side wall of the spline hole is provided with key tooth grooves which are in one-to-one correspondence with the spiral spline teeth, and the spiral spline teeth are in gapless fit with the key tooth grooves; the differential includes a second driven gear that meshes with the second drive gear.

Description

New forms of energy car rear axle reduction gear
Technical Field
The invention relates to the technical field of new energy vehicles, in particular to a rear axle reducer of a new energy vehicle.
Background
For a rear-drive new energy automobile, the speed reducer of an integral rear axle adopted by a fuel oil automobile has a small speed ratio, and the requirement of large speed ratio speed reduction of a high-speed motor of a new energy automobile type cannot be met. According to the characteristics of gear transmission, in order to increase the speed ratio, the conventional method is to change the original bevel gear reducer into a two-stage speed-reducing cylindrical helical gear or a compound gear train speed reducer with a planetary gear, wherein the two-stage speed-reducing cylindrical helical gear speed reducer is most widely applied. However, the speed reducer shell is divided into an integral speed reducer shell and a split speed reducer shell, and the tolerance of the split speed reducer shell during assembly of the two shells is increased, so that the accumulated tolerance of gear assembly positioning is increased, and the gear meshing noise is more difficult to control; the reducer with the integrated shell is characterized in that the middle gear shaft and the large gear on the gear shaft need to be pressed in the shell, so that a flat key or a spline which is convenient to assemble is mostly adopted for matching the middle gear shaft and the large gear, but the flat key and the spline are standardized, a gap is certainly reserved at the matching position in a matching mode, the gap can generate impact abnormal sound, and the comfort of consumers is seriously reduced. (see detail in the analysis and improvement of abnormal sound of electric rear axle-Jiaozhenmei, Yaoming)
Disclosure of Invention
In order to solve the technical problems, the invention provides a rear axle speed reducer of a new energy vehicle, which avoids the speed reducer from generating impact abnormal sound and ensures the comfort of users.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a rear axle speed reducer of a new energy vehicle comprises a speed reducer shell fixed on an axle housing, and a power assembly, an intermediate transmission assembly and a differential mechanism which are arranged in the speed reducer shell, wherein the speed reducer shell is an integral shell;
the power assembly comprises an input shaft, a first driving gear is arranged on the input shaft, and one end of the input shaft extends out of the speed reducer shell and is used for being connected with a driving motor;
the middle transmission assembly comprises a transmission shaft, and a first driven gear and a second driving gear which are arranged on the transmission shaft, the first driven gear is meshed with the first driving gear, the second driving gear and the transmission shaft are integrally formed, the transmission shaft is provided with spiral spline teeth, the center of the first driven gear is provided with a spline hole, the side wall of the spline hole is provided with key tooth grooves which are in one-to-one correspondence with the spiral spline teeth, and the spiral spline teeth are in gapless fit with the key tooth grooves;
the differential includes a second driven gear that meshes with the second drive gear.
Preferably, the transmission shaft is provided with shoulders on two sides of the helical spline teeth, the first driven gear is provided with mounting holes on two sides of the spline hole, and the shoulders are in interference fit with the mounting holes.
Preferably, the mounting holes include a first mounting hole and a second mounting hole, and a diameter of the first mounting hole is larger than a diameter of the second mounting hole.
Preferably, the helical spline teeth and the spline holes are centered with the ruler side.
Preferably, the pressure angle of the helical spline teeth is 25 to 50 degrees, and the helix angle of the helical spline teeth is 25 to 35 minutes.
Preferably, a motor connecting flange is arranged on the speed reducer shell, and the speed reducer shell is connected with the driving motor through the motor connecting flange.
Compared with the prior art, the rear axle speed reducer of the new energy vehicle has the beneficial effects that: the speed reducer shell is an integral shell, so that the defect of noise caused by gear meshing due to a split shell is avoided; meanwhile, the spiral spline teeth are arranged on the transmission shaft, the spline hole is formed in the center of the first driven gear, the spline tooth grooves corresponding to the spiral spline teeth one to one are formed in the spline hole, the spiral spline teeth are in zero-clearance fit with the spline tooth grooves, abnormal sound generated by a connection gap between standard spline connections is avoided, the problem that impact abnormal sound is generated by the speed reducer is solved, and the comfort level of a user is guaranteed. The invention has good use effect and is easy to popularize and use.
Drawings
Fig. 1 is a schematic structural diagram of a rear axle reducer of a new energy vehicle.
Fig. 2 is a schematic structural diagram of the new energy vehicle rear axle speed reducer with the speed reducer shell removed.
Fig. 3 is a schematic structural view of a transmission shaft of the rear axle reducer of the new energy vehicle.
Fig. 4 is a schematic structural diagram of a first driven gear of the rear axle reducer of the new energy vehicle.
Fig. 5 is a schematic cross-sectional view of fig. 4.
FIG. 6 is a schematic view of the spline grooves mating with helical spline teeth.
Wherein: 1-axle housing, 2-speed reducer housing, 3-power assembly, 31-input shaft, 32-first driving gear, 4-intermediate transmission assembly, 41-transmission shaft, 42-first driven gear, 43-second driving gear, 44-spiral spline teeth, 45-spline hole, 46-spline groove, 47-shaft shoulder, 48-first mounting hole, 49-second mounting hole, 5-differential, 51-second driven gear and 6-motor connecting flange.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 to 5, a rear axle reducer for a new energy vehicle according to a preferred embodiment of the present invention includes a reducer casing 2 fixed on an axle housing 1, and a power assembly 3, an intermediate transmission assembly 4 and a differential 5 arranged in the reducer casing 2, wherein the reducer casing 2 is an integral casing;
the power assembly 3 includes an input shaft 31, a first driving gear 32 is disposed on the input shaft 31, the first driving gear 32 and the input shaft 31 are integrally formed, and one end of the input shaft 31 extends out of the reducer housing 2 for connecting a driving motor (not shown in the figure);
the intermediate transmission assembly 4 comprises a transmission shaft 41, and a first driven gear 42 and a second driving gear 43 which are arranged on the transmission shaft 41, wherein the first driven gear 42 is engaged with the first driving gear 32, the second driving gear 43 is integrally formed with the transmission shaft 41, the transmission shaft 41 is provided with spiral spline teeth 44, the center of the first driven gear 42 is provided with a spline hole 45, the side wall of the spline hole 45 is provided with key tooth grooves 46 which are in one-to-one correspondence with the spiral spline teeth 44, and the spiral spline teeth 44 are in gapless fit with the key tooth grooves 46;
the differential 5 includes a second driven gear 51, and the second driven gear 51 is engaged with the second driving gear.
The input shaft 31 and the transmission shaft 41 are rotatably connected by a bearing provided inside the speed reducer housing 2.
According to the new energy vehicle rear axle speed reducer based on the technical characteristics, the speed reducer shell 2 is an integral shell, so that the defect of noise caused by gear meshing due to a split shell is overcome; meanwhile, the spiral spline teeth 44 are arranged on the transmission shaft 41, the spline hole 45 is formed in the center of the first driven gear 42, the spline tooth grooves 46 which correspond to the spiral spline teeth 44 one by one are formed in the spline hole 45, and the spiral spline teeth 44 are in zero-clearance fit with the spline tooth grooves 46, so that abnormal noise generated by a connection gap between standard spline connections is avoided, the problem that impact abnormal noise is generated by a speed reducer is solved, and the comfort level of a user is guaranteed. The invention has good use effect and is easy to popularize and use.
In this embodiment, shaft shoulders 47 are respectively arranged on the two sides of the spiral spline teeth 44 on the transmission shaft 41, mounting holes are respectively arranged on the two sides of the spline hole 45 of the first driven gear 42, and the shaft shoulders 47 are in interference fit with the mounting holes. Through adopting spline zero clearance fit, can solve the impact abnormal sound problem that the spline clearance leads to, but can face another problem because the assembly required precision of gear is very high, fixes a position the gear through the spline and can not reach the assembly requirement, can cause the big scheduling problem of gear engagement noise, and through setting up shoulder 47 with mounting hole interference fit fixes a position, can guarantee the assembly precision of gear, avoids the big problem of gear engagement noise. Meanwhile, in order to facilitate the installation between the transmission shaft 41 and the first driven gear 42, the installation hole includes a first installation hole 48 and a second installation hole 49, and the diameter of the first installation hole 48 is larger than that of the second installation hole 49. When in installation, the first installation hole 48 is penetrated, so that the installation is convenient.
In the present embodiment, the spline is of a non-standard design, and the pressure angle of the helical spline teeth 44 is 25 to 50 degrees, preferably 30, 37.5 or 45 degrees; the helical angle of the helical spline teeth 44 is 25 to 35 minutes, preferably 30 minutes. In addition, it should be noted that the spline has no clearance fit, which means that there is no clearance on both sides of the tooth, but a clearance is reserved at the top of the tooth (see fig. 6). The following is a description of a specific embodiment:
Figure BDA0002763994390000051
in this embodiment, be equipped with motor flange 6 on the speed reducer casing 2, speed reducer casing 2 passes through motor flange 6 with driving motor connects, connects simple and conveniently.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (6)

1. The utility model provides a new forms of energy car rear axle reduction gear which characterized in that: the speed reducer comprises a speed reducer shell fixed on an axle housing, and a power assembly, an intermediate transmission assembly and a differential mechanism which are arranged in the speed reducer shell, wherein the speed reducer shell is an integral shell;
the power assembly comprises an input shaft, a first driving gear is arranged on the input shaft, and one end of the input shaft extends out of the speed reducer shell and is used for being connected with a driving motor;
the middle transmission assembly comprises a transmission shaft, and a first driven gear and a second driving gear which are arranged on the transmission shaft, the first driven gear is meshed with the first driving gear, the second driving gear and the transmission shaft are integrally formed, the transmission shaft is provided with spiral spline teeth, the center of the first driven gear is provided with a spline hole, the side wall of the spline hole is provided with key tooth grooves which are in one-to-one correspondence with the spiral spline teeth, and the spiral spline teeth are in gapless fit with the key tooth grooves;
the differential includes a second driven gear that meshes with the second drive gear.
2. The rear axle reducer of the new energy vehicle according to claim 1, characterized in that: the transmission shaft is provided with a helical spline tooth, the helical spline tooth is arranged on the transmission shaft, shaft shoulders are arranged on two sides of the helical spline tooth respectively, mounting holes are arranged on two sides of the spline hole of the first driven gear respectively, and the shaft shoulders are in interference fit with the mounting holes.
3. The rear axle reducer of the new energy vehicle of claim 2, wherein: the mounting holes comprise a first mounting hole and a second mounting hole, and the diameter of the first mounting hole is larger than that of the second mounting hole.
4. The rear axle reducer of the new energy vehicle according to claim 1, characterized in that: and the spiral spline teeth and the spline holes are centered by ruler sides.
5. The rear axle reducer of the new energy vehicle according to claim 1, characterized in that: the pressure angle of the spiral spline teeth is 25-50 degrees, and the spiral angle of the spiral spline teeth is 25-35 minutes.
6. The rear axle reducer of the new energy vehicle according to claim 1, characterized in that: the speed reducer shell is provided with a motor connecting flange, and the speed reducer shell is connected with the driving motor through the motor connecting flange.
CN202011227296.2A 2020-11-06 2020-11-06 New forms of energy car rear axle reduction gear Withdrawn CN112196975A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN202011227296.2A CN112196975A (en) 2020-11-06 2020-11-06 New forms of energy car rear axle reduction gear

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114962596A (en) * 2022-07-27 2022-08-30 四川丹齿精工科技有限公司 Gear power transmission structure with high assembly probability

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CN207454679U (en) * 2017-09-28 2018-06-05 北京新能源汽车股份有限公司 Retarder and with its electric vehicle
CN207579458U (en) * 2017-12-12 2018-07-06 南京创捷和信汽车零部件有限公司 A kind of small-sized pure electric car driving rear axle assy
CN108437787A (en) * 2018-05-19 2018-08-24 浙江鑫可精密机械有限公司 A kind of New-energy electric vehicle rear-guard direct connection retarder
CN208487178U (en) * 2018-03-26 2019-02-12 北京新能源汽车股份有限公司 For the spline structure of retarder, intermediate shaft assembly, retarder and vehicle
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EP3023630A1 (en) * 2014-11-19 2016-05-25 Robert Bosch Gmbh Electric motor assembly and vehicle starter
CN207454679U (en) * 2017-09-28 2018-06-05 北京新能源汽车股份有限公司 Retarder and with its electric vehicle
CN207579458U (en) * 2017-12-12 2018-07-06 南京创捷和信汽车零部件有限公司 A kind of small-sized pure electric car driving rear axle assy
CN208487178U (en) * 2018-03-26 2019-02-12 北京新能源汽车股份有限公司 For the spline structure of retarder, intermediate shaft assembly, retarder and vehicle
CN108437787A (en) * 2018-05-19 2018-08-24 浙江鑫可精密机械有限公司 A kind of New-energy electric vehicle rear-guard direct connection retarder
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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Application publication date: 20210108

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